DS/PM 自己总结的Case question模版分享

楼主毕业之后去consulting公司工作，后来开始面DS职位结合自己consulting的经验，和地里的很多信息，自己总结出了一套case question的模版，希望对大家有用

建议大家可以多看各种模版，但一定不要生搬硬套，一定要自己做总结，最好是能自己总结出一套答题思路／模版

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目录
第一部分：如何分析数据的变化
第二部分：怎么定义一个metric
第三部分：如何多方位衡量一个project

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第一部分：如何分析数据的变化
例子：假设daily active user上个月降低了10%，请你描述一下要怎么分析这个变化

1. Check whether this is a sudden change or gradual change
2. Is this a company issue or industry trend?
3. Is there any seasonal events or special event?
4. Check if the data is correct (data error, system issue, new feature release)
5. Breakdown the metric into sub metrics
6. Breakdown the metric by region, user segment, age, device, platform, browser
7. Funnel analysis

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第二部分：怎么定义一个metric
例子： 假设click through rate是项目A的主要指标，请你来细分，并且具体得定义一下这个CTR

1. how would you like to measure this metric? Median, avg, p95?
2. Define the aggregation timeframe and measurement timeframe
3. Define the unit of diversion (User ID, Cookie, Event, Device ID, IP address)
4. Define invariant metric
5. Define long term sucess criteria

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第三部分：如何多方位衡量一个project
例子：假设我们公司要launch一个新的dating app，请问你要考虑哪些方面去衡量这个app的success

1. Retention & acquisition
       a. Monthly active users (Net growth = New user – churning user + resurrecting user)
       b. Stickiness DAU/ MAU
       c. Acquisition (What is the life time value of the users acquired, acquisition cost, and what’s the ROI)
       d. Retention and resurrecting
2. Time spent
       a. Login frequency, time spend per day, time spend comparing to similar products
       b. Number of sessions (key actions) per user
       c. Session duration
3. Quality of time spent & User experiences
       a. Interactions (Number of message, post, photo posted, clicks; Number of private interactions between users, number of users that they interacted with)
       b. Satisfaction (Are users finding the content they are looking for? Type of activity they are doing)
       c. Spread of the app usage (Use multiple features and feature retention)
4. Revenue
       a. Clicks for ads, views
       b. Engaging the right customer at the right time for ads  
5. Network effect (among all your products)
       a. Connection among different products (Ripple effect, transition users between products)
6. Other qualitative metrics
       a. Reputation, brand awareness, image of the brand
       b. Product rating, comments from media, social media

不设阅读权限啦～求加米～

很有用的信息！感谢分享

hope I could give you more points, this is so informative

谢谢楼主！！！！！

谢谢分享 楼主大好人呜呜呜

LZ 太好人了！！！！！ 谢谢！！！！！

謝謝LZ Case interview模板的分享